The ornamental design for a handstrap, as shown and described.
FIG. 1 is a perspective view of a hand strap showing my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a top view thereof;
FIG. 7 is a bottom view thereof;
FIG. 8 is another perspective view showing the hand strap being in a usage state;
FIG. 9 is another perspective view showing the hand strap for use with a portable electronic device; and,
FIG. 10 is another perspective view showing the hand strap to support a portable electronic device.
The broken lines shown as dot-dash represent the bounds of the claim and all other broken lines showing the electronic device and the bracket elements are for the purposes of illustrating the environment. None of the broken lines form a part of the claimed design.